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Symptomatological, Serological, and Electrophoretic Diversity of Isolates of Andean Potato Latent Virus from Different Regions of the Andes. R. Koenig, Institut für Viruskrankheiten der Pflanzen, Biologische Bundesanstalt, Messeweg 11, D 3300 Braunschweig, Germany; C. E. Fribourg(2), and R. A. C. Jones(3). (2)Departamento de Sanidad Vegetal, Universidad Nacional Agraria, Apartado 456, Lima, Péru; (3)International Potato Center, Apartado 5969, Lima, Péru. Phytopathology 69:748-752. Accepted for publication 24 January 1979. Copyright 1979 The American Phytopathological Society. DOI: 10.1094/Phyto-69-748.

The serological and electrophoretic properties of twenty-six new isolates of Andean potato latent virus (APLV) from different regions of the Andes varied considerably. Fourteen of these isolates were studied symptomatologically and they all differed. Three major serological strain groups were recognized; the Hu-group was found only in the southern Andes; the CCC-group was found only in the northern Andes; and the Col-Caj-group occurred throughout the Andean region, but it was more common in the north than in the south. Serologically, the Hu-group was related more closely to the type and Abelia latent strains of eggplant mosaic virus than to the Col-Caj and CCC-groups. The three major strain groups were easily differentiated by enzyme-linked immunosorbent assay, whereas in the latex test all were detected by the same sensitized antiserum. In the agar gel double diffusion test, different antisera differed in ability to differentiate between closely related isolates of the Col-Caj-group.

Additional keywords: classification, tymoviruses.